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Preparation method for Teflon dispersion resin for squeezing tube and obtained products

A polytetrafluoroethylene and dispersing resin technology is applied in the field of preparation methods of polyfluorinated organic compounds and the obtained products, which can solve the problems of affecting the performance and appearance of products, overflow of small molecular substances, unstable end group forms, etc. Coagulation time, narrow particle size distribution, good transparency

Active Publication Date: 2015-01-28
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent CN1986577A discloses the use of ammonium persulfate as an initiator to prepare polytetrafluoroethylene dispersion resin for extruded pipes. The form of its end group is unstable, and it is easy to decompose in the process of product processing, causing small molecular substances to overflow, affecting the performance and appearance of the product

Method used

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  • Preparation method for Teflon dispersion resin for squeezing tube and obtained products
  • Preparation method for Teflon dispersion resin for squeezing tube and obtained products
  • Preparation method for Teflon dispersion resin for squeezing tube and obtained products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 50L stainless steel reactor with a spiral stirrer inside. The stirring speed during the reaction was 60 rpm.

[0038]Wash, add 32L of deionized water, 8g of ammonium perfluorooctanoate as dispersant, 2kg of paraffin wax (melting point 56-58°C, the same below), seal the kettle, evacuate and replace with nitrogen, analyze the oxygen content, when the oxygen content is less than or equal to 30ppm, it is qualified . After the oxygen analysis is qualified, 50 g of modifier A perfluoropropylene (HFP) and 25 g of modifier B perfluoropropyl vinyl ether (PPVE) are added. The temperature of the reaction kettle was raised to 65±1°C, and the gas-phase monomer tetrafluoroethylene was put into it, and the pressure in the kettle was 2.5 MPa, and 7 g of peroxysuccinic acid and 0.15 g of ammonium persulfate were added. During the reaction, the pressure in the kettle was maintained at 2.5MPa and the temperature was at 65-70°C. When the feeding amount of tetrafluoroethylene reaches 3Kg...

Embodiment 2

[0041] Utilize the reaction kettle and conical plum blossom agglomeration barrel of Example 1 to operate. The stirring speed during the reaction was 50 rpm.

[0042] A 50L stainless steel reaction kettle was cleaned, added with 32L of deionized water, 8g of ammonium perfluorooctanoate as a dispersant, and 2kg of paraffin. After the oxygen analysis is qualified, 50 g of modifier A perfluoropropylene (HFP) is added. The reaction kettle was heated to 65±1°C, put into the gas phase monomer tetrafluoroethylene, the pressure in the kettle was 2.5MPa, 7g peroxysuccinic acid, 0.15g ammonium persulfate were added, and modifier B perfluoropropyl ethylene was added continuously base ether (PPVE) 40g. During the reaction, the pressure in the kettle was maintained at 2.5MPa and the temperature was at 65-70°C. When the feeding amount of tetrafluoroethylene reaches 3Kg, the remaining dispersant ammonium perfluorooctanoate 42g is continuously added to the polymerization system. When the f...

Embodiment 3

[0045] Utilize the reaction kettle and conical plum blossom agglomeration barrel of Example 1 to operate.

[0046] A 50L stainless steel reaction kettle was cleaned, added with 32L of deionized water, 8g of ammonium perfluorooctanoate as a dispersant, and 2kg of paraffin. After the oxygen analysis is qualified, add modifier A chlorotrifluoroethylene (CTFE) 50g. The reaction kettle was heated to 65±1°C, put into the gas phase monomer tetrafluoroethylene, the pressure in the kettle was 2.7MPa, 7g peroxysuccinic acid, 0.15g ammonium persulfate were added, and modifier B perfluoroethylethylene was added continuously base ether (PEVE) 40g. During the reaction, the pressure in the kettle was maintained at 2.7 MPa and the temperature was at 65-70 °C. When the feeding amount of tetrafluoroethylene reaches 3Kg, the remaining dispersant ammonium perfluorooctanoate 42g is continuously added to the polymerization system. When the feeding amount of tetrafluoroethylene reaches 13Kg, the ...

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Abstract

The invention provides a preparation method for Teflon dispersion resin for a squeezing tube. The preparation method for the Teflon dispersion resin for the squeezing tube includes the steps that (1) deionized water, dispersing agents and paraffin are added into a sealed reaction still to form liquid phase, the air in the reaction still is replaced by nitrogen gas, and then modifier is added into the reaction still, wherein the modifier is composed of modifier A and modifier B; (2) the temperature of the reaction still is increased to 60-80 DEGC, gas-phase monomer is input until the pressure inside the reaction still is 1.5-3.0 MPa, initiator is added, and the polymerization reaction starts; (3) the polymerization reaction is not stopped until the weight of the input gas-phase tetrafluoroethylene monomer accounts for 35-60 percent of the weight of the deionized water. According to the method, a combined initiating system is used in the polymerization process, the modifier A and modifier B are added, a helical ribbon agitator is arranged, a proper stirring speed, pressure and temperature are adopted, and in the after-treatment process, a conical multi-petaled plum-flower-shaped bucket is used for agglomeration to obtain the Teflon dispersion resin.

Description

technical field [0001] The invention belongs to the field of organic macromolecular compounds, in particular to a preparation method of a polyfluorinated organic compound and a prepared product. Background technique [0002] PTFE has excellent chemical corrosion resistance, high and low temperature resistance, aging resistance, low friction, non-stickiness, and physiological inertia, making it an indispensable specialty in chemical, mechanical, electrical, construction, medical and other fields. material, it can be used for a long time in the temperature range of -250 ~ 250 ℃. The preparation of extruded polytetrafluoroethylene resin was studied in the 1940s, and it is a major branch of polytetrafluoroethylene resin, second only to the output of suspended polytetrafluoroethylene resin. With the advancement of dispersion resin molding and processing technology and the widening of the application range of PTFE resin, the quality of extruded PTFE dispersion resin has been impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/26C08F214/28C08F214/24C08F214/22C08F216/14C08F2/01
Inventor 苏小龙张建新胡显权姚权卫秦向明张春静罗湘华
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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